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Class Information
Number: 375/334
Name: Pulse or digital communications > Receivers > Angle modulation > Frequency shift keying
Description: Subject matter where the carrier has been modulated by shifting its frequency in accordance with the pulses transmitted.










Sub-classes under this class:

Class Number Class Name Patents
375/336 Minimum shift keying 107
375/335 More than two frequencies 125
375/337 Separate mark and space channels 42


Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
6831953 Method of, and a radio terminal for, detecting the presence of a 2-FSK signal Dec. 14, 2004
6795485 Integrated QPSK/FSK demodulator Sep. 21, 2004
6785348 Demodulator and method for demodulating CPFSK-modulated signals using a linear approximation of the CPFSK signal Aug. 31, 2004
6785347 Nonlinear-least squares based method and apparatus for FSK signal decoding Aug. 31, 2004
6762642 Method and apparatus for frequency shift-keying demodulation and applications thereof Jul. 13, 2004
6757276 Touch tone replacement for internet telephony Jun. 29, 2004
6757342 Data demodulation Jun. 29, 2004
6751273 Apparatus for compensating a channel distortion in a bluetooth system Jun. 15, 2004
6738435 Matched-filter frequency-shift-keyed receiver using degenerate digital signal processing techniques May. 18, 2004
6724836 Detection of signals transmitted by frequency-shift keying modulation techniques Apr. 20, 2004
6703896 Method and demodulator for FSK demodulation, and receiver including such a demodulator device Mar. 9, 2004
6700941 Digital demodulation apparatus Mar. 2, 2004
6693917 Digital subchannel transceiver for transmitting data Feb. 17, 2004
6671333 Method and apparatus for recovering a payload signal from a signal that has been modulated by frequency shift keying Dec. 30, 2003
6671332 Zero IF receiver with reduced AM detector Dec. 30, 2003
6650712 Low complexity method and apparatus for FSK signal reception Nov. 18, 2003
6633752 Base band signal offset correcting circuit for FSK receiving apparatus and method thereof Oct. 14, 2003
6625233 Method and apparatus in a wireless receiver for demodulating a continuous-phase frequency-shift-keyed signal Sep. 23, 2003
6618449 Receiver for a frequency-shift-keying, continuous-wave radar Sep. 9, 2003
6570937 Frequency scanning FSK receiver May. 27, 2003
6566940 Method and apparatus for frequency shift-keying demodulation and applications thereof May. 20, 2003
6563887 Direct conversion receiver for frequency-shift keying modulated signals May. 13, 2003
6553083 Frequency control and orthogonal detection circuit and FSK receiver Apr. 22, 2003
6539066 Integrable radio receiver circuit for frequency-modulated digital signals Mar. 25, 2003
6529565 Circuit for detecting a center error to correct same Mar. 4, 2003
6487260 Method and apparatus for efficient correlation detection Nov. 26, 2002
6487240 Apparatus for receiving and recovering frequency shift keyed symbols Nov. 26, 2002
6480060 FSK signal demodulating integration-discharge circuit Nov. 12, 2002
6480553 Gaussian frequency-shift keying transciever for ISM wideband communication Nov. 12, 2002
6459333 Differentiate and divide FM demodulator Oct. 1, 2002
6449319 Receiver with a clock signal generator Sep. 10, 2002
6445751 Estimation of frequency offset in a communication system Sep. 3, 2002
6441804 Transmitter and receiver for use in a wireless cursor control system Aug. 27, 2002
6408035 Simplified receiver for frequency shift keyed signals Jun. 18, 2002
6396882 Frequency scanning type receiver May. 28, 2002
6385257 Frequency demodulating circuit, optical disk apparatus thereof and preformating device May. 7, 2002
6380891 GPS receiver with satellite frame synchronization process Apr. 30, 2002
6359942 FSK demodulator Mar. 19, 2002
6332007 Automatic frequency control in FSK receiver using voltage window deviation Dec. 18, 2001
6330458 Intelligent antenna sub-sector switching for time slotted systems Dec. 11, 2001
6323727 Apparatus and method for detecting digital FM Nov. 27, 2001
6304136 Reduced noise sensitivity, high performance FM demodulator circuit and method Oct. 16, 2001
6292655 Selective calling radio-receiver and method of receiving selective calling radio signal Sep. 18, 2001
6288618 Logic-based architecture for FSK modulation and demodulation Sep. 11, 2001
6282414 Wireless selective call receiving apparatus which can reduce current consumption and wireless selective call receiving method Aug. 28, 2001
6272184 Non-coherent frequency shift keying detection scheme Aug. 7, 2001
6236690 Direct-conversion receiver for digital-modulation signal May. 22, 2001
6236898 Error compensation circuit for compensating for parameter errors of an IC chip having a filter and a boost circuit May. 22, 2001
6236689 Device comprising a phase-locked loop, electronic apparatus comprising such a device and method of modulating the frequency of an oscillator May. 22, 2001
6208696 Low power density radio system Mar. 27, 2001

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